freeman



Oct. 2-1, 1941. v w FREEMAN 2,259,809

' W W W A A J h u Filed March 25, 1940 biasing the two inlet valve elements closed piston 6 upwardly. With the two valve elements the pressure in chamber H can be increased in small increments from zero upwardly which is almost impossible, except by very skillful manipulations, where only a single large valve is employed.

Being .aware of the possibility of modifications in the particular structure herein described with out departing from the fundamental principles of my invention, I do not intend that its scope be limited except as set forth by the appended claims.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:-

1. In control valve mechanism, a casing provided with a fluid pressure receiving chamber having an inlet port to be connected to a source of pressure and an outlet port-to be connected with a member to be actuated, means forming a movable wall for said chamber subject to the fluid pressure therein and having an exhaust port, said exhaust port and inlet port being in axial alignment, means for biasing the movable wall to a normally inoperative position, a valve stem extending through the inlet port, an exhaust valve element secured to one end of the stem for cooperation with exhaust port, a main inlet valve element loosely mounted on the stem for closing the inlet port and being subject to a seating pressure from the source of pressure; means forming a fluid passage through the main valve element, a secondary valve element secured to the stem and cooperating with the main valve element to close said passage, said secondary valve element and stem being the sole support for the main valve element when unseated, a spring for the stem to such a position that the exhaust valve element will be open when the movable Wall is in its inoperative position, means on the stem for operating the main inlet valve element after the stem and secondary valve element have been moved to open the passage, and actuating means for moving the wall to thereby close the exhaust valve element and subsequently move said exhaust valve element and stem to successively open the secondary and main inlet valve elements.

2. In control valve mechanism provided with a fluid receiving chamber having an inlet port and a movable wall including an exhaust port aligned with the inlet port, the combination therewith of a valve stem, an exhaust valve element secured to the stem for cooperation with the exhaust port when the wall is moved, a secondary inlet valve element secured to said stem in spaced relation to the exhaust valve element, means for adjusting the relative positions of the exhaust I and secondary valve elements on the stem, a main inlet valve element loosely mounted on the stem between the two named valve elements for cooperation with the inlet port and engageable by the secondary valve element for closing the fluid passage therethrough adjacent the stem, said main inlet valve being. solely supported by the a predetermined distance causing the secondary Valve element to open the fluid passage.

WALTER R. FREEMAN.

Oct. 21, 1941. w. R. FREEMAN 2, 8

CLUTCH AND BRAKE CONTROL MECHANISM Filed Aug. 26, 1940 ZSheets-Sheet 1 v m I g m \J m N n N r N o to r- N I w l O o g l: o

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